Saki, a 32-year-old married woman who works as a swimming instructor at a sports club in Tokyo, watches the male members swimming from the poolside. One man, Yoshino, who looks at her from an erotic perspective, is a swimsuit enthusiast who moves from one swimming class to another, targeting female swimmers as his prey. Yoshino, who has set his sights on his girlfriend Saki, deliberately hits the car she drives and blackmails her using the story of her personal injury accident. And Saki is made to wear a highly revealing perverted swimsuit in class every day... "Aaah, even for a maniac like me, she has the best body." A married woman is surrounded by male members of a sports club and raped.